The Maroon 5 frontman got down one knee to propose to the Victoria's Secret model over the weekend in Los Angeles.
A representative for Adam told People: "Adam Levine and his girlfriend Behati Prinsloo are excited to announce they are engaged to be married."
A date for a wedding is yet to be confirmed but the happy news comes after the couple "recently reunited" following their split in March.
During that time, Adam was linked to Sports Illustrated model Nina Agdal and was seen on holiday with her in Mexico just weeks ago.
Adam, 34, who is a coach on The Voice US, began dating Namibian model Behati in October last year when they made their debut at GQ's Gentleman Ball in New York.
Their relationship began shortly after Adam split from girlfriend of two years, Russian model Anne Vyalitsyna.
Last month, in an interview with Oprah Winfrey, Adam revealed that he wanted to settle down. "I want to probably be married at some point," he said. "I don't feel pressure to get married. I think that when it's time, it's going to be obvious and I'm going to do it and I'm going to really enjoy it.
"I'm a fan of marriage. People think that I keep pooh-poohing marriage, but I love it," he continued.
Check out which other celebrities are planning to tie the knot!
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